AB is a chord of a circle with centre O. The midpoint of the chord is X. The point C lies on the line drawn from X through the point O. Prove that AC = BC.

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.

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